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SML4749A-E3
Public Made by Adomby adom
Vishay Intertech Zener Diodes, DO-214AC(SMA). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownSML4749A-E3
Vishay Intertech · Zener Diodes · DO-214AC(SMA)
SML4749A-E3 from Vishay Intertech, in a DO-214AC(SMA). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | K | passive | Cathode, the end marked with the cathode band; positive terminal in Zener breakdown operation, with nominal VZ of 24 V at IZT1 = 10.5 mA for the SML4749 (±5 % for suffix A). |
| 2 | A | passive | Anode, the terminal opposite the cathode band; the Zener diode is rated for 1000 mW (Ptot at TL = 75 °C) and a 150 °C junction temperature. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Vishay Intertech |
| Package | DO-214AC(SMA) |
| Category | Diodes |
| Pins | 2 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Zener voltage tolerance (suffix A) | VZ | -5 | 5 | % | Suffix A ±5 % | 1 | |
| Reverse current | IR | 5 | μA | at VR = 18.2 V | 2 | ||
| Dynamic resistance | ZZ | 25 | Ω | at IZT1 | 2 | ||
| Dynamic resistance (knee) | ZZK | 750 | Ω | at IZT2 | 2 | ||
| Surge current | IRM | 190 | mApk | Non-repetitive, 8.3 ms pulse width square wave or equivalent sine wave superimposed on IZT | 2 | ||
| Power dissipation | Ptot | 1000 | mW | TL = 75 °C | 1 | ||
| Junction temperature | Tj | 150 | °C | 1 | |||
| Storage temperature range | Tstg | -65 | 150 | °C | 1 | ||
| Nominal zener voltage | VZ | 24 | V | at IZT1 | 2 | ||
| Test current 1 | IZT1 | 10.5 | mA | Zener test current | 2 | ||
| Test current 2 | IZT2 | 0.25 | mA | Knee test current | 2 |
CAD (KiCad official)
- Symbol:
SML4749A-E3 - Footprint:
Diode_SMD:D_SMA - 3D model: DO-214AC(SMA) (KiCad packages3D, STEP)
- 3D model files:
sml4749a-e3-etched.step/sml4749a-e3-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sml4749a-e3.step/sml4749a-e3.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Vishay Intertech datasheet (5 pp, sha256
15b3fea9a6e65941, retrieved 2026-10-22, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text), consensusclaude-sonnet-5-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).